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Stock Based Compensation - Stock Options, Restricted Stock and Restricted Stock Units Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Feb. 08, 2019
Feb. 07, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Options          
Balance at beginning of period (shares) 55,174 55,174 0 55,174  
Granted (shares)   0 8,000,000    
Exercised (shares)   0      
Forfeited (shares)     (350,000)    
Forfeited or expired (shares)   0      
Vested (shares)     0    
Balance at end of period (shares)   55,174 7,650,000 0 55,174
Expected to vest at end of period (shares)     3,490,000    
Exercisable at end of period (shares)   55,174 4,160,000    
Weighted-Average Exercise price          
Balance at beginning of period (USD per share) $ 84.15 $ 84.15 $ 0 $ 84.15  
Granted (USD per share)     22.00    
Forfeited (USD per share)     22.00    
Vested (USD per share)     0    
Balance at end of period (USD per share)   84.15 22.00 0 $ 84.15
Expected to vest at end of period (USD per share)     22.00    
Exercisable at end of period (USD per share)     22.00    
Weighted Average Grant-Date Fair Value Per Share          
Balance at beginning of period (USD per share) 84.15 84.15 0 84.15  
Granted (USD per share)   0      
Exercised (USD per share)   0      
Forfeited and expired (USD per share)   0      
Balance at end of period (USD per share)   84.15 $ 22.00 $ 0 $ 84.15
Exercisable at end of period (USD per share)   $ 84.15      
Weighted Average Remaining Contractual Term (in years) of options outstanding   3 years 1 month 6 days 6 years 6 months   3 years 2 months 12 days
Weighted Average Remaining Contractual Term (in years) of options expected to vest     6 years 6 months    
Weighted Average Remaining Contractual Term (in years) of options exercisable   3 years 1 month 6 days 6 years 6 months    
Aggregate intrinsic value of options outstanding   $ 3.4 $ 22.2 $ 3.2
Aggregate intrinsic value of options expected to vest     10.1    
Aggregate intrinsic value of options exercisable   $ 3.4 $ 12.1    
Cash value per share of stock repurchased and retired during period (USD per share) $ 145        
Restricted stock and restricted stock units          
Number of Shares          
Granted (shares)     702,899    
Forfeited (shares)     0    
Vested (shares)     0    
Shares          
Nonvested at beginning of period (shares)     0    
Granted (shares)     702,899    
Vested (shares)     0    
Forfeited (shares)     0    
Nonvested at end of period (shares)     702,899 0  
Weighted-Average Grant Date Fair Value          
Balance at beginning of period (USD per share)     $ 0    
Granted (USD per share)     25.95    
Forfeited (USD per share)     0    
Vested (USD per share)     0    
Balance at end of period (USD per share)     $ 25.95 $ 0  
Weighted Average Remaining Contractual Term (in years)     1 year 3 months 18 days    
Aggregate Intrinsic Value (in millions)          
Aggregate intrinsic value of equity instruments other than options outstanding     $ 17.5  
Performance-based Restricted Stock Units          
Number of Shares          
Granted (shares)   0      
Forfeited (shares)   (869)      
Vested (shares)   0      
Shares          
Nonvested at beginning of period (shares) 148,094 143,236   143,236  
Granted (shares)   0      
Adjustment for Shares Earned against Target (shares)   5,727      
Vested (shares)   0      
Forfeited (shares)   (869)      
Nonvested at end of period (shares)   148,094     143,236
Weighted-Average Grant Date Fair Value          
Balance at beginning of period (USD per share) $ 122.07 $ 122.11   $ 122.11  
Granted (USD per share)   0     $ 143.63
Adjustment for Shares Earned against Target (USD per share)   0.00      
Forfeited (USD per share)   129.33      
Vested (USD per share)   0      
Balance at end of period (USD per share)   $ 122.07     $ 122.11
Weighted Average Remaining Contractual Term (in years)         1 year 3 months 18 days
Aggregate Intrinsic Value (in millions)          
Aggregate intrinsic value of equity instruments other than options nonvested   $ 21.5     $ 20.4
Service-based Restricted Stock Units          
Number of Shares          
Granted (shares)   0      
Forfeited (shares)   (869)      
Vested (shares)   (1,253)      
Shares          
Nonvested at beginning of period (shares) 125,327 122,757   122,757  
Granted (shares)   0      
Vested (shares)   (1,253)      
DERs (shares)   4,692      
Forfeited (shares)   (869)      
Nonvested at end of period (shares)   125,327     122,757
Weighted-Average Grant Date Fair Value          
Balance at beginning of period (USD per share) $ 112.86 $ 111.74   $ 111.74  
Granted (USD per share)       $ 123.54
Forfeited (USD per share)   121.65      
Vested (USD per share)   117.91      
DERs (USD per share)        
Balance at end of period (USD per share)   $ 112.86     $ 111.74
Weighted Average Remaining Contractual Term (in years)   1 year     1 year 1 month 6 days
Aggregate Intrinsic Value (in millions)          
Aggregate intrinsic value of equity instruments other than options nonvested   $ 18.2     $ 17.5
Phantom Units          
Weighted Average Grant-Date Fair Value Per Share          
Number of equity instruments other than options converted (shares)     205,546